AR-10, this is MY answer, and it is an opinion only-
Who cares? If you are going to be busted, I seriously doubt you'll be singled out for having a non-NFA weapon with a few bad features. How many people REALY have the MIBs show up at their door to haul them away for something like that? Less than 1% of all gun owners, and I'd put BIG money on that. Read my post about obeying unconstitutional laws.
You arnt even TALKING about having a 'post ban Assault weapon' in your posession, so I seriously doubt that unless you assembeled it, it'd even be illegal. It might give some asshole agent who is just LOOKING for something to gig you on a chance, but unless it was on the gun when they found it, I realy seriously doubt they can do anything, legaly about it.
If they want to confiscate your guns, you can have a closet full of bolt action antiques and old pump 12-guages, and they'll take them and dont have to give them back to you for as long as they can keep up the leaglese.
My advice to you is dont live in fear of 'them'. If they want you, they'll get you, broken law or no. If you want to take a 'bad' gun out in the desert or the mountains and shoot your AR with a bayonet mounted, you'll probably get struck by lightening because of the gun before you get in trouble because of it. Most LEOs in my experience dont even CARE about the AWB unless you give them a reason to.